On April 4, 1968, a movement lost its leader when the Reverend Martin Luther King, Jr. was killed in Memphis, Tennessee. But four children also lost their father. Yolanda was 12 years old. Martin was 10, Dexter was seven and the youngest, Bernice was just five. Many people in America still mourn the civil rights leader, fifty years later. His three surviving children deal with the loss on their own terms. ‘‘That period, for me, is like yesterday,'' said Dexter King, now 57. "People say it's been 50 years, but I'm living in step time. Forget what he did in terms of his service and commitment and contribution to humankind ... I miss my dad.'' His children hold on to the few memories they have of him. For years, they have had to publicly mourn a man who was among the most hated in America at the time of his death. Now King is beloved around the world.